volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Vacuum Pump, Brakes > < Vacuum Brake Booster Check Valve|Testing and Inspection
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Specified value: infinity ohms

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Check wire between 2-pin connector terminal 1 and fuse holder for open circuit according to wiring diagram.

Wire resistance: max. 3.0 ohms

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Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.  

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Generate readiness code.  

If no malfunctions are found in wires:

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Replace Engine Control Module (ECM) -J623-

Check-valve, checking

The check valve - A - must allow air through in direction of - arrow -. 
^

Check-valve must remain closed in opposite direction.

Observe correct installation position!

Vacuum Pump, Brakes > < Vacuum Brake Booster Check Valve|Testing and Inspection